<div class="form-group">
    <label for="ddlCarrera" class="col-sm-2 control-label">Carrera</label>
    <div class="col-sm-10">
        <select id="ddlCarrera" class="form-control" name="ddlCarrera">
            <option disabled="disabled">Carreras</option>
            {combo_carrera}
        </select>
    </div>
</div>